Where is functions for do_action ?

Hi,
I’m searching to put a pixel when user is registered and a variable in url is true.
So I want to put in the activation url a new variable but i’m complety lost in register.php. I can’t find the action who send email about activation and when i’m searching action like “bp_before_registration_confirmed” in all project, I find nothing.
Can you help me please ?

Thanks for your reply Roger Coathup,
I’m not a developper expert, so if i have to create my own action for sending a email with a new variable in the url activation, I have to read before how the first action is made. And I can’t find it

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